Silverlight学习笔记十七BingMap（七）之检索地理位置(GeocodeService服务)

我会带着你远行 2022-03-28 18:57 205阅读 0赞

GeocodeService服务用来检索地理位置

效果如图

![2010082312014751.png][]

一、添加服务引用

GeocodeService服务也是WCF服务，地址是[http://dev.virtualearth.net/webservices/v1/geocodeservice/GeocodeService.svc][http_dev.virtualearth.net_webservices_v1_geocodeservice_GeocodeService.svc]

二、实例

1. public class ChinaTileSource  
\{  
/// <summary>  
/// 加载中国地图系统  
/// [http://r2.tiles.ditu.live.com/tiles/r\{quadkey\}.png?g=41][http_r2.tiles.ditu.live.com_tiles_r_quadkey_.png_g_41]中国地图系统  
/// </summary>  
/// <returns>TileSource</returns>  
public TileSource GetChinaTileSource()  
\{  
UriBuilder tileSourceUri = new UriBuilder("[http://r2.tiles.ditu.live.com/tiles/r\{quadkey\}.png?g=41][http_r2.tiles.ditu.live.com_tiles_r_quadkey_.png_g_41]");

MapTileLayer tileLayer = new MapTileLayer();  
LocationRectTileSource tileSource = new LocationRectTileSource(tileSourceUri.Uri.ToString()  
, new LocationRect(new Location(60, 60), new Location(13, 140)), new Range<double>(1, 16));  
return tileSource;  
\}  
\}

2.前台

</UserControl>

3.后台

public partial class GeocodeServiceDemo : UserControl  
\{  
const string BingMapID = "AkGGA\_JlwP7XGV8JxIPb8oEWxrInlLMGKpCe7QM4QB5cg4UGNCqUyjqVfC0B2-XC";  
public GeocodeServiceDemo()  
\{  
InitializeComponent();  
  
MapTileLayer tileLayer = new MapTileLayer();  
ChinaTileSource gts = new ChinaTileSource();

tileLayer.TileSources.Add(gts.GetChinaTileSource());  
myMap.Children.Add(tileLayer);  
\}

/// <summary>  
/// 检索

///根据国家或地名检索  
/// GeocodeRequest用来处理正向检索请求  
/// </summary>  
/// <param name="sender"></param>  
/// <param name="e"></param>  
private void btnQuery\_Click(object sender, RoutedEventArgs e)  
\{  
GeocodeServiceClient client = new GeocodeServiceClient();  
client.GeocodeCompleted += new EventHandler<GeocodeCompletedEventArgs>(OnGeocodeCompleted);

//创建请求  
GeocodeRequest request = new GeocodeRequest();  
request.Credentials = new Credentials();

//BingMap ID  
request.Credentials.ApplicationId = BingMapID;

//检索条件  
request.Query = this.tbName.Text.Trim();

//进行检索  
client.GeocodeAsync(request);  
\}

private void OnGeocodeCompleted(object sender, GeocodeCompletedEventArgs e)  
\{  
if (e.Error == null)  
\{  
//获取结果  
GeocodeResponse response = e.Result;  
double latitude = response.Results\[0\].Locations\[0\].Latitude;  
double longitude = response.Results\[0\].Locations\[0\].Longitude;

this.tbLatitude.Text = latitude.ToString();  
this.tbLongitude.Text = longitude.ToString();

//根据经纬度和级别设置视图,并显示该位置  
myMap.SetView(new Location(latitude, longitude), 4);  
\}  
\}

/// <summary>  
/// 反向检索

///根据经纬度检索  
/// ReverseGeocodeRequest用来处理反向检索请求  
/// </summary>  
/// <param name="sender"></param>  
/// <param name="e"></param>  
private void btnQueryReverse\_Click(object sender, RoutedEventArgs e)  
\{  
GeocodeServiceClient client = new GeocodeServiceClient();  
client.ReverseGeocodeCompleted += new EventHandler<ReverseGeocodeCompletedEventArgs>(OnReverseGeocodeCompleted);

ReverseGeocodeRequest request = new ReverseGeocodeRequest();  
request.Credentials = new Credentials();  
request.Credentials.ApplicationId = BingMapID;  
request.Location = new Location(int.Parse(this.tbLongitude.Text), int.Parse(this.tbLatitude.Text));  
client.ReverseGeocodeAsync(request);  
\}

private void OnReverseGeocodeCompleted(object sender, ReverseGeocodeCompletedEventArgs e)  
\{  
if (e.Error == null)  
\{  
if (e.Result.Results.Count > 0)  
\{  
GeocodeResponse response = e.Result;  
this.tbName.Text = response.Results\[0\].DisplayName;

double latitude = response.Results\[0\].Locations\[0\].Latitude;  
double longitude = response.Results\[0\].Locations\[0\].Longitude;  
//根据经纬度和级别设置视图,并显示该位置，这一点很重要啊。  
myMap.SetView(new Location(latitude, longitude), 4);  
\}  
else  
MessageBox.Show("没有检索到该地址");  
\}  
\}  
\}

[2010082312014751.png]: /images/20220328/11472f6a6f604fe394d581b50ad6ce56.png
[http_dev.virtualearth.net_webservices_v1_geocodeservice_GeocodeService.svc]: http://dev.virtualearth.net/webservices/v1/geocodeservice/GeocodeService.svc
[http_r2.tiles.ditu.live.com_tiles_r_quadkey_.png_g_41]: http://r2.tiles.ditu.live.com/tiles/r%7Bquadkey%7D.png?g=41
[http_schemas.microsoft.com_winfx_2006_xaml_presentation]: http://schemas.microsoft.com/winfx/2006/xaml/presentation
[http_schemas.microsoft.com_winfx_2006_xaml]: http://schemas.microsoft.com/winfx/2006/xaml
[http_schemas.microsoft.com_expression_blend_2008]: http://schemas.microsoft.com/expression/blend/2008
[http_schemas.openxmlformats.org_markup-compatibility_2006]: http://schemas.openxmlformats.org/markup-compatibility/2006